PHNOM PENH (Reuters) - A sharp drop in the number Mekong
dolphins born in Cambodia has renewed fears for the survival of
the rare mammals, wildlife experts said on Wednesday.

Only three baby dolphins, one of them dead, were found
during an annual survey conducted in late November, down from
six newborns in previous years, Touch Seang Tana told Reuters.

Their weight had also dropped to under 2 kg (4.4 lb) from 5
kg (11 lb) in the 1980s, the chairman of the Commission for
Mekong Dolphins Conservation said.

"A group of 10 full-grown dolphins living in the upper
Mekong River had no babies at all this year," he said, blaming
a shortage of fish and rising water temperatures which might
have affected their reproductive systems.

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There are about 150 dolphins living in the upper Mekong
River, up from only 90 before a 2006 ban on net fishing in the
eastern provinces of Kratie and Steung Treng.

Conservationists had hoped for a surge in newborn dolphins
after the ban was imposed.

"Global warming may be a possible indirect threat to the
dolphin population, particularly if their fitness is reduced,"
said Teak Seng of the World Wildlife Fund.

"Dolphins are very sensitive to changes in their
environment such as water temperature and quality. Other
factors may be more influential such as diseases and water
pollution," he said.